PT-2025-8905 · Linux+5 · Linux Kernel+5

Published 2025-02-06 · Updated 2026-04-20 · CVE-2025-21793

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A division by zero issue has been resolved in the Linux kernel. The problem occurs when there are no dummy cycles in the spi-nor commands, causing both dummy bus cycle bytes and width to be zero. To avoid a CPU warning due to division by zero, the code now returns zero, thus preventing such calculations.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

ALT-PU-2025-12647

AZL-57761

BDU:2025-12005

CVE-2025-21793

OESA-2025-1446

OESA-2025-1450

OPENSUSE-SU-2025_1177-1

OPENSUSE-SU-2025_1178-1

OPENSUSE-SU-2025_1180-1

SUSE-SU-2025:01919-1

SUSE-SU-2025:1177-1

SUSE-SU-2025:1178-1

SUSE-SU-2025:1180-1

SUSE-SU-2025:20190-1

SUSE-SU-2025:20192-1

SUSE-SU-2025:20260-1

SUSE-SU-2025:20270-1

SUSE-SU-2025_1177-1

SUSE-SU-2025_1178-1

SUSE-SU-2025_1180-1

USN-7521-1

USN-7521-2

USN-7521-3

USN-7703-1

USN-7703-2

USN-7703-3

USN-7703-4

USN-7719-1

USN-7737-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Linux Kernel

Suse

Ubuntu

References · 1644

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21793.json · Exploit
• https://ubuntu.com/security/CVE-2024-57997 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-38240 · Security Note
• https://ubuntu.com/security/CVE-2025-21727 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-22049 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21780 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-56651 · Security Note
• https://ubuntu.com/security/CVE-2025-21721 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21716 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21871 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21725 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21745 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21941 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21927 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21914 · Security Note